fairly quickly I think, my tank is only 7 months old and I probably have spots on 40% of my 150lbs of rock. this is definately rusty iron orange color. each month I can see more spots so I would say its spreading aggresively.
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custom 8 foot 220g w/ starfire , 125g sump, 2x4ft NewWave T5 HO's, eshopps psk 300 skimmer, 2xmag18 return pumps, GFO and GAC reactors,
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